A method and system to provide service availability to multi-mode terminals in different access networks is presented. In an embodiment, a computer-readable medium includes instructions that, when executed by a computer, cause the computer to automatically enable first call forwarding prior to a wireless multi-mode communication terminal access from a first communication network to a second communication network, where first calls are redirected from a first directory number of the first communication network to a second directory number of the second communication network. The computer-readable medium also includes additional instructions that, when executed by the computer, cause the computer to automatically disable second call forwarding subsequent to the wireless multi-mode communication terminal access change when the second call forwarding conflicts with the enabled first call forwarding. The second call forwarding includes redirecting incoming second calls to a first directory number of the first communication network.